CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2013-086

DATE(S) ISSUED:
09/10/2013

SUBJECT:
Vulnerabilities in Microsoft Access Could Allow Remote Code Execution (MS13-074)

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft's database software, Access, which could allow an attacker to take complete control of an affected system. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.


SYSTEMS AFFECTED:

  • Microsoft Office 2007
  • Microsoft Office 2010
  • Microsoft Office 2013

RISK:

Government:

  • Large and medium government entities: High
  • Small government entities: High

Businesses:

  • Large and medium business entities: High
  • Small business entities: High

Home users: High

DESCRIPTION:
Three vulnerabilities have been privately reported in Microsoft Access. These vulnerabilities can be triggered by opening a specially crafted Access file and can be exploited via email or through the web. In the email-based scenario, the user would have to open the specially crafted Access file as an email attachment. In the web based scenario, a user would have to open the specially crafted Access file that is hosted on a website. When the user opens the Access file, the attacke''s supplied code will execute. Details of these vulnerabilities are as follows:

File Format Memory Corruption Vulnerability

One remote code execution vulnerabilities exist in the way Access handles memory when opening specially crafted Access files.

Memory Corruption Vulnerabilities

Two remote code execution vulnerabilities exist in the way Access accesses objects in memory that have not been properly initialized or deleted.

Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

RECOMMENDATIONS:
We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.

REFERENCES:

Microsoft:
https://technet.microsoft.com/en-us/security/bulletin/ms13-074

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-32155
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-32156
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-32157

SecurityFocus:

http://www.securityfocus.com/bid/62229
http://www.securityfocus.com/bid/62230
http://www.securityfocus.com/bid/62231